Stator manufacturing method and device therefor

Abstract

The present invention pertains to a stator manufacturing method and a device therefor. All of segments are twisted in order to obtain a stator, the linear sections of the segments being inserted into slots in a stator core. The segments on the inner peripheral side are subsequently twisted after the segments on the outer peripheral side are untwisted. In order to achieve this, e.g., a fourth spindle that is positioned on the outermost peripheral side and is one of the first through fourth spindles for twisting the segments is disconnected from a fourth motor and brought to a non-rotatable state. The following is then performed in sequence: the third spindle is disconnected from a third motor and twisted, and the second spindle is disconnected from the second motor and twisted.

What is claimed is: 
     
       1. A method for producing a stator, the method by which a stator is obtained by inserting, into slots formed in a circumferential direction of a stator core, segments for a coil, each being substantially in a shape of a letter U and including a first linear portion and a second linear portion which extend substantially in parallel with each other and face each other and a turn portion which connects to the first linear portion and the second linear portion, the method comprising:
 a step of inserting a plurality of the segments for the coil into the slots in a parallel state, with one of the first linear portion and the second linear portion being located on an inner peripheral side of the stator core and another of the first linear portion and the second linear portion being located on an outer peripheral side; 
 a step of inserting an end of the first linear portion or the second linear portion, the end exposed from the slot, into each of insertion concave portions of a plurality of twisting and bending jigs which are independently rotatable; 
 a step of twisting and bending all the segments for the coil by rotating all of the plurality of twisting and bending jigs at a predetermined angle while moving the stator core toward the plurality of twisting and bending jigs; and 
 a step of further twisting and bending the segments for the coil on the inner peripheral side by putting the segment for the coil on the outer peripheral side into a state where the segment for the coil is not twisted by not allowing the twisting and bending jig with the insertion concave portion into which the end of the first linear portion or the second linear portion of the segment for the coil is inserted, to rotate, and rotating, at a predetermined angle, the twisting and bending jigs with the insertion concave portions into which the ends of the first linear portions or the second linear portions of the segments for the coil on the inner peripheral side are inserted while moving the stator core toward the plurality of twisting and bending jigs. 
 
     
     
       2. The method for producing a stator according to  claim 1 , wherein
 by moving, when the segments for the coil on the inner peripheral side are twisted and bent, the twisting and bending jig with the insertion concave portion into which the end of the first linear portion or the second linear portion of the segment for the coil on the outer peripheral side is inserted, in a direction in which the twisting and bending jig moves away from the stator core, the twisting and bending jig is put into a state where the twisting and bending jig is not allowed to rotate. 
 
     
     
       3. A stator production apparatus for obtaining a stator by twisting and bending segments for a coil which are inserted into slots formed in a circumferential direction of a stator core, the segments for a coil each being substantially in a shape of a letter U and including a first linear portion and a second linear portion which extend substantially in parallel with each other and face each other and a turn portion which connects to the first linear portion and the second linear portion, the stator production apparatus comprising:
 a stator core holding jig configured to hold the stator core with the slots into which a plurality of the segments for the coil are inserted in a parallel state, with one of the first linear portion and the second linear portion being located on an inner peripheral side of the stator core and another of the first linear portion and the second linear portion being located on an outer peripheral side; 
 a plurality of twisting and bending jigs configured to be independently rotatable and including insertion concave portions formed therein, wherein an end, which is exposed from the slot, of the first linear portion or the second linear portion is inserted into the insertion concave portions; 
 rotating mechanisms, each configured to rotate a corresponding one of the plurality of twisting and bending jigs; 
 a displacing mechanism configured to displace the stator core holding jig in a direction in which the stator core holding jig moves away from or closer to the twisting and bending jigs; and 
 stoppers configured to restrict or allow movements, in a height direction of the stator core, of the plurality of twisting and bending jigs by being displaced. 
 
     
     
       4. The stator production apparatus according to  claim 3 , wherein the stoppers release the twisting and bending jigs which finished twisting of the segments for the coil and allow the twisting and bending jigs to move in the height direction of the stator core. 
     
     
       5. The stator production apparatus according to  claim 3 , wherein the stoppers are pistons. 
     
     
       6. The stator production apparatus according to  claim 3 , wherein the stoppers are displaceable pins. 
     
     
       7. The stator production apparatus according to  claim 6 , wherein the pins are pins configured to move in a straight line. 
     
     
       8. The stator production apparatus according to  claim 6 , wherein the pins are pins configured to turn.